LesScope

Arduino based Dual Channel Scope for eurorack-modular synths.

Table of Contents

• Introduction
• Construction Guide
• LesScope-Menu
• Technical data
• References
• License

Introduction

This eurorack-modul is designed for modular-synthesizers as dual channel scope modul.
Only two active parts are required to sample the signal at the jack-inputs.

1. Arduino Nano V3.x.
2. Quad Op Amp MCP6004 rail-to-rail input/output.

The Arduino Nano samples the amplified signal on two 10-Bit A/D multiplexed inputs.
Sampled-data are then traced on the 1.3'' OLED display.
Dataentry and menu-selections are possible with that encoder Select.
AC/DC coupling is selectable for both channels on two switches.
Every channel has two jacks linked together for signal-input and routing to other inputs.
That signal on Channel1 is normalized to the Trigger input-jack.
With an additonal cable plugged into the Trigger jack a different trigger-signal can be used.

All parts are common available and DIY-friendly designed.
(Details see attached pictures)

• Modul Frontpanel
  

• Modul Backside
  

• Modul Right side
  

• Modul Left side
  

• Dual Trace example
  

LesScope-Menu

• Menu example
  

Technical data

• size:
  height: 3VP (133,35mm)
  width : 8HP ( 40,3mm)
  depth : 35mm

• power:
  +5Volt, 0 mA
  +12Volt, 45mA
  -12Volt, 0 mA

• display:
  128x64 pixel 1.3inch OLED with SPI interface

• MCU:
  Arduino Nano V3.x ATmega 328P

• Electrical features:
  Rotary encoder with push-button.
  Two separate channels with AC/DC-coupling.
  Input Voltage 10Vp-p for both channels.
  Menu selectable signal-amplification (1...4:Channel1; 1...2:Channel2).
  Sampling-rate range: 50us...100msec on both channels.
  Separate trigger-input (default linked to Channel1).

• Measurement-capabilities (only on Channel1):
  Frequency-measurement range: ~10Hz...~6000Hz.
  Tuning-check range: C0(16.35Hz)...C8(4186.01Hz).

There are fife 3.5mm jacks available with following functions.

Jack-Name	Function	Comment
Channel1 (two jacks)	Signal input for Channel1	the two jacks are linked together and this signal is normalized to Trigger input.
Channel2 (two jacks)	Signal input for Channel2	the two jacks are linked together.
Trigger	Signal input for Trigger	this signal is normalized to Channel1.

References

• mzuelch Display
• frequency measure
• encoder
• Adafruit SH110X display-driver
• midi conversion table

License

Hardware:cc by-nc-sa 4.0 (details)
Software:licensed under GPL-3.0 (details)